Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 7573a1d8192032c8a7af0e8e61f359e5b22b2fc4
  - Merge "Add a DG for PNF software rollback action"
  - Add a DG for PNF software rollback action
    
    Add a DG for LCM:rollback action to support PNF software rollback.
    
    Change-Id: Id82e1dc20a0792713fb079ea302f7d71e2949fc8
    Issue-ID: SDNC-670
    Signed-off-by: Enbo Wang <wangenbo@huawei.com>
    
1 file changed